JP6893898B2 - 磁気粘弾性エラストマー放射配向成形体の製造方法及び製造装置 - Google Patents
磁気粘弾性エラストマー放射配向成形体の製造方法及び製造装置 Download PDFInfo
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- JP6893898B2 JP6893898B2 JP2018110233A JP2018110233A JP6893898B2 JP 6893898 B2 JP6893898 B2 JP 6893898B2 JP 2018110233 A JP2018110233 A JP 2018110233A JP 2018110233 A JP2018110233 A JP 2018110233A JP 6893898 B2 JP6893898 B2 JP 6893898B2
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Images
Classifications
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- H01—ELECTRIC ELEMENTS
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- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0273—Imparting anisotropy
- H01F41/028—Radial anisotropy
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/58—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres
- B29C70/62—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres the filler being oriented during moulding
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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- B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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- H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
- H01F1/442—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids the magnetic component being a metal or alloy, e.g. Fe
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- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2505/00—Use of metals, their alloys or their compounds, as filler
- B29K2505/08—Transition metals
- B29K2505/12—Iron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2905/00—Use of metals, their alloys or their compounds, as mould material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
- B29K2995/0008—Magnetic or paramagnetic
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- Moulds For Moulding Plastics Or The Like (AREA)
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Description
(A)ベースポリマー成分:1分子中に平均2個以上かつ分子鎖両末端のケイ素原子に結合したアルケニル基を含有する直鎖状オルガノポリシロキサン
(B)架橋成分:1分子中に平均2個以上のケイ素原子に結合した水素原子を含有するオルガノハイドロジェンポリシロキサンが、前記A成分中のケイ素原子結合アルケニル基1モルに対して、1モル未満の量
(C)白金系金属触媒:A成分に対して重量単位で0.01〜1000ppm
(D)磁性フィラー:組成物を100体積%としたとき1〜70体積%
(E)無機粒子顔料:マトリックス樹脂100重量部に対して0.1〜10重量部
ベースポリマー成分(A成分)は、一分子中にケイ素原子に結合したアルケニル基を2個以上含有するオルガノポリシロキサンであり、アルケニル基を2個含有するオルガノポリシロキサンは本発明のシリコーンゴム組成物における主剤(ベースポリマー成分)である。このオルガノポリシロキサンは、アルケニル基として、ビニル基、アリル基等の炭素原子数2〜8、特に2〜6の、ケイ素原子に結合したアルケニル基を一分子中に2個有する。粘度は25℃で10〜1000000mPa・s、特に100〜100000mPa・sであることが作業性、硬化性などから望ましい。
本発明のB成分のオルガノハイドロジェンポリシロキサンは架橋剤として作用するものであり、この成分中のSiH基とA成分中のアルケニル基とが付加反応(ヒドロシリル化)することにより硬化物を形成するものである。かかるオルガノハイドロジェンポリシロキサンは、一分子中にケイ素原子に結合した水素原子(即ち、SiH基)を2個以上有するものであればいずれのものでもよく、このオルガノハイドロジェンポリシロキサンの分子構造は、直鎖状、環状、分岐状、三次元網状構造のいずれであってもよいが、一分子中のケイ素原子の数(即ち、重合度)は2〜1000、特に2〜300程度のものを使用することができる。
C成分の触媒成分は、本組成物の硬化を促進させる成分である。C成分としては、ヒドロシリル化反応に用いられる触媒として周知の触媒を用いることができる。例えば白金黒、塩化第2白金、塩化白金酸、塩化白金酸と一価アルコールとの反応物、塩化白金酸とオレフィン類やビニルシロキサンとの錯体、白金ビスアセトアセテート等の白金系触媒、パラジウム系触媒、ロジウム系触媒などの白金族金属触媒が挙げられる。C成分の配合量は、硬化に必要な量であればよく、所望の硬化速度などに応じて適宜調整することができる。A成分に対して金属原子重量として0.01〜1000ppm添加する。
前記磁性粉は、アルコキシシラン又はアルキルチタネートにより表面処理しておくのが好ましい。この表面処理をしておくとシリコーンゴムの場合、硬化阻害を防ぐことができる。前記アルコキシシランは、R(CH3)aSi(OR’)3-a(Rは炭素数1〜20のアルキル基、R’は炭素数1〜4のアルキル基、aは0もしくは1)で示されるシラン化合物、もしくはその部分加水分解物が好ましい。R(CH3)aSi(OR’)3-a(Rは炭素数1〜20のアルキル基、R’は炭素数1〜4のアルキル基、aは0もしくは1)で示されるアルコキシシラン化合物(以下単に「シラン」という。)は、一例としてメチルトリメトキシラン,エチルトリメトキシラン,プロピルトリメトキシラン,ブチルトリメトキシラン,ペンチルトリメトキシラン,ヘキシルトリメトキシラン,ヘキシルトリエトキシシラン,オクチルトリメトキシシラン,オクチルトリエトキシラン,デシルトリメトキシシラン,デシルトリエトキシシラン,ドデシルトリメトキシシラン,ドデシルトリエトキシシラン,ヘキサデシルトリメトキシシラン,ヘキサデシルトリエトキシシシラン,オクタデシルトリメトキシシラン,オクタデシルトリエトキシシシラン等のシラン化合物がある。前記シラン化合物は、一種又は二種以上混合して使用することができる。表面処理剤として、アルコキシシランと片末端シラノールシロキサンを併用してもよい。ここでいう表面処理とは共有結合のほか吸着なども含む。
本発明の組成物には、必要に応じて前記以外の成分を配合することができる。例えばベンガラなどの無機顔料、フィラーの表面処理等の目的でアルキルトリアルコキシシランなどを添加してもよい。フィラー表面処理などの目的で添加する材料として、アルコキシ基含有シリコーンを添加しても良い。
永久磁石:ネオジム磁石
下面磁性体、側面磁性体:鉄鋼
非磁性体:アルミニウム合金
金属金型:鉄鋼
磁性フィラー:ステンレススチール製ワイヤー
<硬さ>
日本ゴム協会標準規格(SRIS0101)に規定されているアスカーC硬度を測定した。
1.材料成分
(1)シリコーン成分
シリコーン成分として二液室温硬化シリコーンゴムを使用した。なお、二液RTVにはベースポリマー成分(A成分)と架橋成分(B成分)と白金系金属触媒(C成分)が予め添加されている。
(2)磁性フィラー
磁性フィラーとして、ステンレススチール製ワイヤー(直径12μm、長さ1mm)を、シリコーン成分100重量部に対して5重量部配合した。
(3)永久磁石
永久磁石は図9に示す形状のネオジム磁石(株式会社マグファイン社製、商品名”ネオジム”)を使用した。このネオジム磁石の内容は表1に示すとおりである。表1中、表面処理はNiめっきのことである。
図3及び図7A−Bに示す成形装置を使用して、温度:50℃、時間:10分で成形した。その結果、図2に示す放射配向成形体が得られた。この放射配向成形体の大きさは、外径40mm、内径30mm、厚さ5mmであった。
磁性フィラーとして、平均粒子径3.9−5.0μmのカルボニル鉄粉を50体積%の割合で添加し、均一に混合した以外は実施例1と同様とした。その結果、図2に示す成形体と同様のカルボニル鉄粉が放射配向した成形体が得られた。この放射配向成形体の大きさは、外径40mm、内径30mm、厚さ5mmであった。
2 マトリックス樹脂
3 磁性フィラー
4,15,26 空間部
10,16−18,21,23 放射配向成形装置
11 永久磁石
12a−12g 磁性体
13a−13d,27a 非磁性体
14a 金属製金型
14b リング状キャビティー
19a−19e 磁束
20a,20b 移動手段
24 ネオジム磁石
25 円筒状磁石体
Claims (13)
- マトリックス樹脂と磁性フィラーを含む磁気粘弾性エラストマー放射配向成形体の製造方法であって、
永久磁石を少なくとも1箇所配置し、前記永久磁石はキャビティーを有する金属製金型中央部の上部及び下部から選ばれる少なくとも一方であってかつ前記キャビティーと離した位置に配置し、
前記金属製金型の少なくとも一部の上下面には非磁性体を配置するとともに、前記金属製金型の側面には磁性体を配置し、
前記永久磁石から発生する磁束を前記金属製金型の側面から通過させる閉磁路を設け、
前記キャビティー内に充填したマトリックス樹脂と磁性フィラーを含む組成物の前記磁性フィラーを放射状に配向させて成形することを特徴とする磁気粘弾性エラストマー放射配向成形体の製造方法。 - 前記永久磁石の形状は、円筒状である請求項1に記載の磁気粘弾性エラストマー放射配向成形体の製造方法。
- 前記永久磁石の下面に磁性体を配置し、前記金型の側面の磁性体と磁性体で接続する請求項1又は2に記載の磁気粘弾性エラストマー放射配向成形体の製造方法。
- 前記永久磁石と前記金型の間に磁性体又は非磁性体を配置する請求項1〜3のいずれかに記載の磁気粘弾性エラストマー放射配向成形体の製造方法。
- 前記磁性フィラーは、磁性ワイヤー、磁性粉体、磁性膜を有する無機粉体、板状粉体及び磁気に反応するフィラーから選ばれる少なくとも一つである請求項1〜4のいずれかに記載の磁気粘弾性エラストマー放射配向成形体の製造方法。
- 前記磁性ワイヤーは金属ワイヤーである請求項5に記載の磁気粘弾性エラストマー放射配向成形体の製造方法。
- 前記磁性粉体は、カルボニル鉄粉、Fe−Si合金、Fe−Al合金、Fe−Si−Al合金(センダスト)、Fe−Si−Cr合金、Fe−Ni合金(パーマロイ)、Fe−Ni−Co合金(ミューメタル)、Fe−Ni−Mo合金(スーパーマロイ)、Fe−Co合金、Fe−Si−Al−Cr合金、Fe−Si−B合金、Fe−Si−Co−B合金等の鉄系の合金粉から選ばれる少なくとも一つである請求項5に記載の磁気粘弾性エラストマー放射配向成形体の製造方法。
- 前記磁気粘弾性エラストマー放射配向成形体を100体積%としたとき、前記磁性フィラーは1〜70体積%である請求項1〜7のいずれかに記載の磁気粘弾性エラストマー放射配向成形体の製造方法。
- 前記マトリックス樹脂はオルガノポリシロキサンである請求項1〜8のいずれかに記載の磁気粘弾性エラストマー放射配向成形体の製造方法。
- 前記永久磁石はネオジム、フェライト、サマリウムコバルト等の硬磁性材料から作られる永久磁石である請求項1〜9のいずれかに記載の磁気粘弾性エラストマー放射配向成形体の製造方法。
- 前記金属製金型を前記閉磁路に組み込むため、及び前記金属製金型を前記閉磁路から取り外して永久磁石の磁力を受けない位置に移動するために、前記金属製金型の移動手段を設けた請求項1〜10のいずれかに記載の磁気粘弾性エラストマー放射配向成形体の製造方法。
- 請求項1〜11のいずれかに記載の磁気粘弾性エラストマー放射配向成形体の製造方法に使用するための製造装置であって、
マトリックス樹脂と磁性フィラーを含む組成物を充填するためのキャビティーを有する金属製金型と、
前記金属製金型中央部の上部及び下部から選ばれる少なくとも一方であってかつ前記キャビティーと離した位置に配置した永久磁石と、
前記金属製金型の少なくとも一部の上下面には非磁性体を配置するとともに、前記金属製金型の側面には磁性体を配置し、
前記永久磁石から発生する磁束を前記金属製金型の側面から通過させるための閉磁路を設けたことを特徴とする磁気粘弾性エラストマー放射配向成形体の製造装置。 - 前記金属製金型を前記閉磁路に組み込むため、及び前記金属製金型を前記閉磁路から取り外して永久磁石の磁力を受けない位置に移動するために、前記金属製金型の移動手段を設けた請求項12に記載の磁気粘弾性エラストマー放射配向成形体の製造装置。
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